I bought a Christmas duvet cover for DS maybe 10 years ago from a reputable department store. It’s been used only at Christmas, washed max 20 times and stored in the airing cupboard with other similar items.
This year on washing, it literally fell apart.
I have a reusable carrier bag from the supermarket division of the same company. It is dated 2007 and is completely intact and has been used at Christmas each year.
AIBU to expect a cotton duvet cover to remain usable longer than a plastic carrier bag?!